How should drop-in visit price compare to house sitting?

I was doing overnight house-sitting visits for one client when a regular asked me if I could do overnight visits for her dogs. I had to explain that I was already booked overnight but that I could offer drop-in visits throughout the day. She accepted this proposal, but when she created her request, we realized that my pricing scheme resulted in it costing far more for 3 drop-in visits than it would for me to stay the entire night.

  This made me realize a considerable dilemma.  Driving to the house and back is a lot of work on my end, which justifies charging more.  However, on the consumer's end doing this actually provides inferior care for their pets compared to me just staying there overnight (1.5 hours versus 10 hours), which explains why they wouldn't be willing to pay as much for 3 drop-in visits compared to one night of housesitting.  Part of me wonders if I should simply get rid of my drop-in option entirely and only offer to housesit because it really makes sense for both the dogs and myself.  However, drop-in visits really do make sense for cats because they do not require as much daily contact as dogs, nor do they need to be walked (I read an article by a vet stating that cats can be left alone for up to 24 hours but that this should not become a regular thing.).  In addition, offering drop-ins might allow me to reach a wider pool of potential clients who use different search categories.


 My question is: how do your drop-in prices compare to your overnight housesitting prices, and how did you decide on this?  Has anyone decided not to offer drop-in visits for dogs at all?